Flanging machine for packaging box production

Abstract

The utility model discloses an edging machine for packing box production, which comprises a support frame, a shell and a conveyor, the conveyor is mounted in the middle of the support frame, a conveying belt of the conveyor penetrates through a cavity part in the middle of the shell, a feeding component for conveying cartons is mounted outside the shell, and the feeding component is connected with the shell. The carton preheating device comprises a shell, a preheating assembly used for preheating a carton is installed in the shell, a driving assembly used for providing power is installed in the shell, and one end of the driving assembly is connected with the preheating assembly. The distance between the heating plate and a carton can be accurately adjusted according to temperature data, so that the carton is preheated at a proper temperature, the problem that the flexibility and plasticity of paper are reduced due to low temperature is effectively solved, the paper is not prone to being broken and broken in the edge folding process, and the edge folding quality is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of folding machine technology, specifically a folding machine for packaging box production. Background Technology

[0002] In the current booming food industry, food packaging boxes, as an important carrier of food, directly affect the market competitiveness of food and the economic benefits of enterprises through their quality and production efficiency. In winter, when the ambient temperature is low, the paper, cardboard and other materials used in cardboard boxes will become brittle and hard due to the low temperature, and their flexibility and plasticity will decrease.

[0003] Existing folding machines are not designed to fully account for the impact of low temperatures in winter, making it difficult to adjust to the effects of temperature changes on the properties of cardboard materials. This makes it difficult to ensure folding quality and efficiency in winter. Moreover, most of them are not equipped with dedicated heating devices, making it impossible to preheat the cardboard materials. This makes the paper more prone to cracking and breaking during the folding process, affecting the folding quality and the overall strength of the cardboard box. Utility Model Content

[0004] The purpose of this utility model is to provide a folding machine for packaging box production to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a folding machine for producing packaging boxes, comprising a support frame, a housing, and a conveyor, wherein the conveyor is installed in the middle of the support frame, the conveyor belt of the conveyor passes through the hollow part in the middle of the housing, and a feeding assembly for conveying cartons is installed on the outside of the housing;

[0006] The interior of the housing is equipped with a preheating assembly for preheating the carton;

[0007] The housing contains a drive assembly for providing power, one end of which is connected to a preheating assembly.

[0008] The interior of the housing is equipped with a spray assembly for softening the cardboard box, one end of which extends to the exterior of the housing;

[0009] A pressing assembly for pressing the carton is installed on the outside of the housing, one end of which extends to the bottom of the support frame. A folding assembly for folding the carton is also installed on the outside of the housing.

[0010] Preferably, the feeding assembly includes a storage box, a carton suction lifter, and a first top plate. The storage box is installed outside the housing and at the front of the conveyor. The top of the carton suction lifter is installed at the bottom of the first top plate, and one side of the first top plate is installed on one side surface of the housing.

[0011] Preferably, the preheating component includes a first ceramic heating plate, a second ceramic heating plate, and a horizontal plate. The top of the first ceramic heating plate is connected to the bottom of the horizontal plate, and both are located inside the housing. The two ends of the horizontal plate extend to one end of the drive component. An infrared temperature sensor is fixedly installed above the cavity on the side of the housing near the carton suction lifter.

[0012] Preferably, the driving assembly includes an electric slide rod, and the inner walls of both sides of the housing in the vertical direction are provided with long grooves. The electric slide rod is located inside the long groove and is adapted to the long groove. Both ends of the horizontal plate are slidably connected to the surface of the electric slide rod.

[0013] Preferably, the spray assembly includes a water tank, a water pump, a first water inlet pipe, a second water inlet pipe, an ultrasonic atomizer, a water storage cover, and a spray nozzle. The water tank is located outside the housing. The pumping end of the water pump is connected to one end of the water tank, and the pump draining end is connected to one end of the first water inlet pipe. The end of the first water inlet pipe away from the pump is connected to the water inlet end of the ultrasonic atomizer. The mist outlet end of the ultrasonic atomizer is connected to one end of the second water inlet pipe. The end of the second water inlet pipe away from the mist outlet end of the ultrasonic atomizer is connected to the interior of the water storage cover. The spray nozzle is connected to the bottom of the water storage cover. The water storage cover is installed on the top of the housing, and a temperature and humidity sensor is installed on the bottom of the water storage cover.

[0014] Preferably, the pressing assembly includes a rotating roller, a connecting frame, a motor, a pulley assembly, and a fixing block. The motor is mounted on the outside of the housing via the fixing block and is located at the bottom of the support frame. The connecting frame passes through the support frame and is movably connected to the pulley assembly via a rotating shaft. The two ends of the rotating roller are rotatably connected to the end of the connecting frame away from the pulley assembly. A position sensor is fixedly installed above the cavity on the side of the housing away from the carton suction lifter.

[0015] Preferably, the folding assembly includes a second top plate, a robotic arm, and a material drop box. One side of the second top plate is mounted on the other side surface of the housing. The top of the robotic arm is mounted on the bottom of the second top plate. A vision sensor is mounted on the surface of the robotic arm. The robotic arm is located outside the housing and above the conveyor belt of the conveyor. The material drop box is installed outside the housing and at the very end of the conveyor.

[0016] Preferably, a protective cover is installed above the water storage cover, and a controller and an alarm are installed inside the protective cover, with the controller and the alarm being electrically connected.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention, through the cooperation of a preheating component and a driving component, can precisely adjust the distance between the heating plate and the carton according to temperature data, so that the carton is preheated at a suitable temperature. This effectively improves the problem of reduced paper flexibility and plasticity caused by low temperature, making it less likely for the paper to crack or break during the folding process, and greatly improving the folding quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial structural diagram of the spray assembly of this utility model;

[0021] Figure 3 This is a partial structural diagram of the drive component of this utility model;

[0022] Figure 4 This is a schematic diagram of the preheating component structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the pressing component structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the water storage cover structure of this utility model.

[0025] In the diagram: 1. Support frame; 2. Housing; 3. Conveyor; 4. Storage box; 5. Carton suction and lifting machine; 6. First top plate; 7. First ceramic heating plate; 8. Second ceramic heating plate; 9. Horizontal plate; 10. Infrared temperature sensor; 11. Electric sliding rod; 12. Long trough; 13. Water tank; 14. Water pump; 15. First water inlet pipe; 16. Second water inlet pipe; 17. Ultrasonic atomizer; 18. Water storage cover; 19. Spray nozzle; 20. Temperature and humidity sensor; 21. Rotating roller; 22. Connecting frame; 23. Motor; 24. Pulley assembly; 25. Position sensor; 26. Second top plate; 27. Robotic arm; 28. Drop box; 29. ​​Vision sensor; 30. Protective cover; 31. Controller; 32. Alarm; 33. Fixing block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-6This utility model provides a technical solution: a folding machine for packaging box production, including a support frame 1, a housing 2, and a conveyor 3. The conveyor 3 is installed in the middle of the support frame 1. The support frame 1 serves as the basic support structure for the entire equipment, providing a stable mounting foundation for the conveyor 3, housing 2, and other components. The conveyor belt of the conveyor 3 passes through the hollow part in the middle of the housing 2. A feeding assembly for conveying cartons is installed on the outside of the housing 2. The housing 2 serves to protect the internal components. The conveyor 3 is used to convey cartons. The feeding assembly includes a storage box 4 and a carton suction cup. The cardboard box 5 and the first top plate 6 are installed outside the housing 2 and at the front of the conveyor 3. The storage box 4 is used to store the cardboard boxes to be processed, which serves to temporarily store and organize the cardboard boxes. The top of the cardboard box suction and lifting machine 5 is installed at the bottom of the first top plate 6, and one side of the first top plate 6 is installed on one side surface of the housing 2. The first top plate 6 provides installation support for the cardboard box suction and lifting machine 5. The cardboard box suction and lifting machine 5 uses suction to accurately pick up or lift the cardboard boxes in the storage box 4 and place them on the conveyor belt of the conveyor 3, so as to realize automatic feeding of cardboard boxes and improve the efficiency and accuracy of feeding.

[0028] The housing 2 houses a preheating assembly for preheating the cardboard box. This assembly includes a first ceramic heating plate 7, a second ceramic heating plate 8, and a horizontal plate 9. The top of the first ceramic heating plate 7 is connected to the bottom of the horizontal plate 9, both located inside the housing 2. Both ends of the horizontal plate 9 extend to one end of the drive assembly. An infrared temperature sensor 10 is fixedly installed above the cavity on the side of the housing 2 closest to the cardboard box suction machine 5. This sensor detects infrared radiation from the cardboard box surface, accurately measures the temperature of the cardboard box, and feeds the temperature data back to the controller 31. The controller 31 then adjusts the temperature according to the set temperature... The temperature range is adjusted to ensure the carton is preheated to a suitable temperature. The first ceramic heating plate 7 converts electrical energy into heat energy to generate high temperature, which preheats the carton entering the housing 2. Preheating softens the carton material, making it easier for subsequent softening and pressing operations. The second ceramic heating plate 8 works in conjunction with the first ceramic heating plate 7 to heat the carton from different directions, making the carton heat more evenly and further improving the preheating effect. This ensures that the carton can better adapt to the requirements of the processing technology in subsequent processing. The horizontal plate 9 connects the first ceramic heating plate 7 and the drive component, serving to support and transmit power.

[0029] The housing 2 houses a drive assembly for providing power. One end of the drive assembly is connected to the preheating assembly. The drive assembly includes an electric slide rod 11. Long slots 12 are provided on both sides of the vertical inner wall of the housing 2. The electric slide rod 11 is located inside the long slots 12 and is adapted to the long slots 12. Both ends of the horizontal plate 9 are slidably connected to the surface of the electric slide rod 11. As the core component of the drive assembly, the electric slide rod 11 achieves telescopic movement through electric control. It slides in the long slots 12, driving the horizontal plate 9 to move up and down, thereby adjusting the height of the preheating assembly. This allows the preheating assembly to adapt to the preheating requirements of cartons of different sizes and thicknesses, improving the versatility and flexibility of the equipment. The long slots 12 are provided on both sides of the vertical inner wall of the housing 2, providing space for the installation and sliding of the electric slide rod 11, ensuring that the electric slide rod 11 can operate stably inside the housing 2, and also providing a certain guiding and protective function for the electric slide rod 11.

[0030] The interior of the housing 2 is equipped with a spray assembly for softening cardboard boxes. One end of the spray assembly extends to the outside of the housing 2. The spray assembly includes a water tank 13, a water pump 14, a first water inlet pipe 15, a second water inlet pipe 16, an ultrasonic atomizer 17, a water storage cover 18, and a spray nozzle 19. The water tank 13 is located outside the housing 2 and is used to store clean water. The pump 14's suction end is connected to one end of the water tank 13, and its discharge end is connected to one end of the first water inlet pipe 15. The water pump 14 is used to soften cardboard boxes. The first water inlet pipe 15, located away from the water pump 14, is connected to the water inlet of the ultrasonic atomizer 17. The first water inlet pipe 15 connects the water pump 14 and the ultrasonic atomizer 17, serving as a water delivery channel. The mist outlet of the ultrasonic atomizer 17 is connected to one end of the second water inlet pipe 16. The end of the second water inlet pipe 16, located away from the mist outlet of the ultrasonic atomizer 17, is connected to the interior of the water storage cover 18. The ultrasonic atomizer 17 utilizes the high-frequency oscillation principle of ultrasound to convert the incoming water into tiny water mist particles, achieving the desired water delivery. The water is atomized, allowing the atomized water mist to be sprayed more evenly onto the surface of the cardboard box, improving the softening effect. The spray nozzle 19 is connected to the bottom of the water storage cover 18 and is used to spray water mist onto the cardboard box surface. The second water inlet pipe 16 connects the mist outlet of the ultrasonic atomizer 17 to the inside of the water storage cover 18, delivering the water mist generated by the ultrasonic atomizer 17 to the water storage cover 18, providing atomized clean water to the spray nozzle 19 for spray softening treatment of the cardboard box. The water storage cover 18 is installed on the top of the housing 2. A temperature and humidity sensor 20 is installed at the bottom of the water storage cover 18. The water storage cover 18 is installed on the top of the housing 2 and is used to store the water mist generated by the ultrasonic atomizer 17 and distribute the water mist evenly to the spray nozzle 19. The temperature and humidity sensor 20 is installed at the bottom of the water storage cover 18 to monitor the temperature and humidity changes in the spray area in real time and feeds back the detected temperature and humidity data to the controller 31. The controller 31 adjusts the spray components according to the set temperature and humidity range to ensure that the temperature and humidity in the spray area are kept within a suitable range.

[0031] A pressing assembly for pressing cartons is installed on the outside of the housing 2. One end of the pressing assembly extends to the bottom of the support frame 1. The pressing assembly includes a rotating roller 21, a connecting frame 22, a motor 23, a pulley set 24, and a fixing block 33. The motor 23 is mounted on the outside of the housing 2 via the fixing block 33, which securely mounts the motor 23 to the outside of the housing 2. The motor 23 provides power to the pressing assembly and is located at the bottom of the support frame 1. The connecting frame 22 penetrates the support frame 1 and is movably connected to the pulley set 24 via a rotating shaft. The pulley set 24 connects the motor 23 and the rotating roller 21, serving as a power transmission medium to transmit the power of the motor 23 to the rotating roller 21, achieving smooth power transmission. The connecting frame 22 also penetrates the support frame 1 and is movably connected to the pulley set 24 via a rotating shaft, connecting the rotating roller 21 to the pulley set 24 to transmit power, enabling the rotating roller 21 to rotate under the drive of the motor 23, thus achieving the pressing operation of the cartons. Simultaneously, the connecting frame 22 also supports the rotating roller 21, ensuring its stability during operation. Both ends of the rotating roller 21 are rotatably connected to the end of the connecting frame 22 furthest from the pulley assembly 24. Within the pressing assembly, the rotating roller 21 contacts and rotates with the carton surface, performing a pressing operation on the spray-softened carton. The surface of the rotating roller 21 can be designed with different shapes and materials to adapt to the pressing requirements of different types of cartons, making the carton surface smoother and improving its strength and quality. A position sensor 25 is fixedly installed directly above the cavity on the side of the housing 2 furthest from the carton suction machine 5. The position sensor 25 monitors the carton's position on the conveyor 3 in real time. When the carton reaches the set pressing position, the position sensor 25 sends a signal back to the controller 31. The controller 31 then controls the pressing assembly to begin operation, performing a pressing operation on the carton to ensure the accuracy and timeliness of the pressing operation.

[0032] A folding assembly for folding the edges of cartons is installed on the exterior of housing 2. The folding assembly includes a second top plate 26, a robotic arm 27, and a material dropper 28. One side of the second top plate 26 is mounted on the other side surface of housing 2, and the top of the robotic arm 27 is mounted on the bottom of the second top plate 26. The second top plate 26, mounted on the other side surface of housing 2, provides mounting support for the robotic arm 27, ensuring its stability during operation. A vision sensor 29 is mounted on the surface of the robotic arm 27. The robotic arm 27 is located outside housing 2 and above the conveyor belt of conveyor 3, mounted on the bottom of the second top plate 26. Located outside the housing 2 and above the conveyor belt of the conveyor 3, the robotic arm 27 performs edge folding operations on the pressed cartons through its flexible movement. The surface of the robotic arm 27 is equipped with vision sensors 29, which can monitor the position and shape of the cartons in real time and adjust the folding angle and force according to the actual situation of the cartons to improve the accuracy and quality of the folding. The material drop box 28 is installed outside the housing 2 and at the end of the conveyor 3. It is used to collect the cartons after edge folding and serves to temporarily store and organize the finished cartons, facilitating subsequent handling and packaging operations.

[0033] A protective cover 30 is installed above the water storage cover 18. Inside the protective cover 30, a controller 31 and an alarm 32 are installed. The protective cover 30 is installed above the water storage cover 18 to protect the controller 31 and alarm 32 inside and prevent dust, debris, water vapor and other contaminants from entering the protective cover 30. The controller 31 and the alarm 32 are electrically connected. Through the electrical connection with the controller 31, when an abnormal situation occurs during the operation of the equipment, such as excessively high or low temperature, abnormal humidity, or incorrect carton position, the controller 31 will trigger the alarm 32 to issue an alarm signal, reminding the operator to deal with the abnormal situation in time and avoid equipment failure or product quality problems.

[0034] During operation, the carton suction and lifting machine 5 picks up the carton from the storage box 4 and places it on the conveyor belt of the conveyor 3. The conveyor 3 then transports the carton into the housing 2. When the carton passes directly above the cavity of the housing 2, the infrared temperature sensor 10 monitors the temperature of the carton surface in real time and feeds the temperature data back to the controller 31. The controller 31 compares the temperature data fed back by the infrared temperature sensor 10 with the preset temperature value.If the temperature is lower than the preset value, the drive assembly starts working, the electric slide bar 11 starts, and drives the horizontal plate 9 and its connected first ceramic heating plate 7 to move vertically. If the temperature is lower than the preset value, the controller 31 will control the electric slide bar 11 to further adjust the position of the first ceramic heating plate 7, making it closer to the carton to enhance the heating effect. If the temperature is higher than the preset value, the controller will control the electric slide bar 11 to move the first ceramic heating plate 7 away from the carton to reduce the heating intensity, so that the carton can be preheated at a suitable temperature. After preheating, the electric slide bar 11 is reset. When the carton passes under the water storage cover 18, the temperature and humidity sensor 20 begins to detect the carton in real time. The temperature and humidity data of the surrounding environment and the surface of the cardboard box are transmitted by the temperature and humidity sensor 20 to the controller 31 located inside the protective cover 30. If the detected humidity value is lower than the preset standard, the water pump 14 is started, and water is delivered to the ultrasonic atomizer 17 through the first water inlet pipe 15. The ultrasonic atomizer 17 converts the incoming water into water mist, which enters the water storage cover 18 through the second water inlet pipe 16 and is then sprayed out by the spray nozzle 19 connected to the bottom of the water storage cover 18 to spray the cardboard box. When the cardboard box approaches the pressing assembly, the position sensor 25 detects the position information of the cardboard box and transmits it to the controller 31. The controller 31... 1. Based on the position information, the motor 23 is started when the carton reaches the appropriate position. The power of the motor 23 is transmitted to the connecting frame 22 through the pulley group 24. The connecting frame 22 drives the rotating roller 21 to rotate. When the carton passes under the rotating roller 21, the rotating roller 21 applies a certain pressure to the carton, so that the carton is pressed together under the drive of the conveyor belt, making the surface of the carton flatter and more compliant. When the carton reaches under the robotic arm 27, the vision sensor (29) identifies and detects the shape, position and other information of the carton, and transmits the data to the controller 31. The controller 31 controls the robotic arm 27 to process the carton according to the predetermined program based on the information fed back by the vision sensor 29. After folding, the carton finally falls into the material box 28 installed on the outside of the housing 2, completing the entire folding production process of the packaging box. During the process, if the temperature and humidity data detected by the temperature and humidity sensor 20 exceeds the preset safety range, or if the vision sensor 29 detects abnormalities in the position, shape, or other aspects of the carton, or if other components malfunction, the controller 31 will receive the corresponding abnormal signal. After receiving the abnormal signal, the controller 31 will immediately issue a command to activate the alarm 32. The alarm 32 will emit an alarm sound or other warning signals to remind the operator to check and handle the situation, so as to ensure the normal operation of the equipment and the quality of the product.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A folding machine for producing packaging boxes, comprising a support frame (1), a housing (2), and a conveyor (3), characterized in that: The conveyor (3) is installed in the middle of the support frame (1), and the conveyor belt of the conveyor (3) passes through the cavity in the middle of the housing (2). The outside of the housing (2) is equipped with a feeding assembly for conveying the carton. The housing (2) is equipped with a preheating component for preheating the carton; The housing (2) is equipped with a drive assembly for providing power, one end of which is connected to the preheating assembly; The interior of the housing (2) is equipped with a spray assembly for softening the carton, one end of which extends to the exterior of the housing (2); The outer side of the housing (2) is equipped with a pressing assembly for pressing the carton, one end of which extends to the bottom of the support frame (1), and the outer side of the housing (2) is equipped with a folding assembly for folding the carton.

2. The folding machine for producing packaging boxes according to claim 1, characterized in that: The feeding assembly includes a storage box (4), a carton suction lifter (5), and a first top plate (6). The storage box (4) is installed outside the housing (2) and at the front end of the conveyor (3). The top of the carton suction lifter (5) is installed at the bottom of the first top plate (6), and one side of the first top plate (6) is installed on one side surface of the housing (2).

3. A folding machine for producing packaging boxes according to claim 2, characterized in that: The preheating assembly includes a first ceramic heating plate (7), a second ceramic heating plate (8), and a horizontal plate (9). The top of the first ceramic heating plate (7) is connected to the bottom of the horizontal plate (9), and both are located inside the housing (2). The two ends of the horizontal plate (9) extend to one end of the drive assembly. An infrared temperature sensor (10) is fixedly installed above the cavity on the side of the housing (2) near the carton suction machine (5).

4. A folding machine for producing packaging boxes according to claim 3, characterized in that: The drive assembly includes an electric slide rod (11). The inner walls of both sides of the housing (2) in the vertical direction are provided with long grooves (12). The electric slide rod (11) is located inside the long groove (12) and is adapted to the long groove (12). Both ends of the horizontal plate (9) are slidably connected to the surface of the electric slide rod (11).

5. A folding machine for producing packaging boxes according to claim 1, characterized in that: The spray assembly includes a water tank (13), a water pump (14), a first inlet pipe (15), a second inlet pipe (16), an ultrasonic atomizer (17), a water storage cover (18), and a spray nozzle (19). The water tank (13) is located outside the housing (2). The pumping end of the water pump (14) is connected to one end of the water tank (13), and the draining end of the water pump (14) is connected to one end of the first inlet pipe (15). The end of the first inlet pipe (15) is away from the water pump (14). The water inlet of the ultrasonic atomizer (17) is connected to the mist outlet of the ultrasonic atomizer (17), and one end of the second water inlet pipe (16) is connected to the mist outlet of the ultrasonic atomizer (17). The end of the second water inlet pipe (16) away from the mist outlet of the ultrasonic atomizer (17) is connected to the interior of the water storage cover plate (18). The spray nozzle (19) is connected to the bottom of the water storage cover plate (18). The water storage cover plate (18) is installed on the top of the housing (2), and a temperature and humidity sensor (20) is installed on the bottom of the water storage cover plate (18).

6. A folding machine for producing packaging boxes according to claim 2, characterized in that: The pressing assembly includes a rotating roller (21), a connecting frame (22), a motor (23), a pulley group (24), and a fixing block (33). The motor (23) is installed on the outside of the housing (2) through the fixing block (33) and is located at the bottom of the support frame (1). The connecting frame (22) passes through the support frame (1) and is movably connected to the pulley group (24) through a rotating shaft. The two ends of the rotating roller (21) are respectively rotatably connected to the end of the connecting frame (22) away from the pulley group (24). A position sensor (25) is fixedly installed above the cavity on the side of the housing (2) away from the carton suction lifter (5).

7. A folding machine for producing packaging boxes according to claim 6, characterized in that: The folding assembly includes a second top plate (26), a robotic arm (27), and a material drop box (28). One side of the second top plate (26) is mounted on the other side surface of the housing (2). The top of the robotic arm (27) is mounted on the bottom of the second top plate (26). A vision sensor (29) is mounted on the surface of the robotic arm (27). The robotic arm (27) is located outside the housing (2) and above the conveyor belt of the conveyor (3). The material drop box (28) is mounted outside the housing (2) and at the end of the conveyor (3).

8. A folding machine for producing packaging boxes according to claim 5, characterized in that: A protective cover (30) is installed above the water storage cover (18). A controller (31) and an alarm (32) are installed inside the protective cover (30). The controller (31) and the alarm (32) are electrically connected.

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